One is the existence of a “Party in revolt against the de jure government (which) possess an organized military force, an authority responsible for its acts, acting within a determined territory and having the means of respecting and ensuring respect for the Convention.” Second is that “the legal government is obliged to have recourse to the regular military forces against insurgents organized as military and in possession of a part of the national territory.” Third, there must be a recognition of the insurgents as belligerents by the state. Finally the insurgents must have the “characteristics of a state.” Obviously none of these things exist in the US: There is no “insurgency” occurring in the US.

But what of Porter’s more straightforward humanitarian claim? Is there some agreed upon international norm at stake in the number of gun deaths that occur in the US such that “intercession by the UN and all relevant NGOs” is necessary? The US – probably the most important political actor there is – doesn’t appear to think such a norm exists. And who would enforce this norm anyway?

Though the situation of gun violence is the US is definitely tragic, it is not clear that the world should intervene.